/* 	ship.cc
	This file is part of the Osirion project
*/

// C++ headers
#include <iostream>

// project headers
#include "common/functions.h"
#include "common/osirion.h"

#include "ship.h"

Ship::Ship()
{
	speed = 0;
	yaw = 0;
	yaw_offset = 0;

	thrust = 0;
	
	// ship specs
	acceleration = 6 * GAMESCALE;
	max_speed = 16.0f * GAMESCALE;
	
	max_yaw_offset = 45;
	yaw_speed = 4;
}

Ship::~Ship() 
{
}

void Ship::update(float elapsed) 
{
	// update yaw
	float d = yaw_speed * elapsed * yaw_offset;
	yaw_offset -= d;
	yaw +=d;

	// update thrust
	if (speed < thrust * max_speed) {
		speed += acceleration * elapsed;
		if (speed > thrust * max_speed) {
			speed = thrust * max_speed;
		}
	} else if(speed > thrust * max_speed) {
		speed -= acceleration * elapsed;
		if (speed < 0) speed = 0;
	}

	// location TODO avoid sin/cos calculations
	location.x += cosf(yaw * M_PI / 180) * speed * elapsed;
	location.z -= sinf(yaw * M_PI / 180) * speed * elapsed;
}


void Ship::thrust_increase()
{
	thrust += 0.05;
	if (thrust > 1) thrust = 1;
}

void Ship::thrust_decrease()
{
	thrust -= 0.08;
	if (thrust < 0) thrust = 0;
}

void Ship::turn_left() 
{
	//yaw = degreesf(yaw + 2);
	yaw_offset += 2;
	if (yaw_offset > max_yaw_offset)
		yaw_offset = max_yaw_offset;
}

void Ship::turn_right() 
{
	//yaw = degreesf(yaw - 2);
	yaw_offset -= 2;
	if (yaw_offset < -max_yaw_offset)
		yaw_offset = - max_yaw_offset;
}